Fast-ICA Based Blind Estimation of Spreading and Information Sequences of Short-Code CDMA Signals in Synchronous and Asynchronous Systems

REN Xiao-tian; XU Hui; HUANG Zhi-tao; LU Feng-bo

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Fast-ICA Based Blind Estimation of Spreading and Information Sequences of Short-Code CDMA Signals in Synchronous and Asynchronous Systems

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- Fast-ICA Based Blind Estimation of Spreading and Information Sequences of Short-Code CDMA Signals in Synchronous and Asynchronous Systems
- Acta Electronica Sinica Vol. 39, Issue 12, Pages: 2726-2732(2011)
- 作者机构：
  
  国防科技大学电子科学与工程学院,湖南,长沙,410073
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN911
- Published：2011
- 稿件说明：
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REN Xiao-tian, XU Hui, HUANG Zhi-tao, et al. Fast-ICA Based Blind Estimation of Spreading and Information Sequences of Short-Code CDMA Signals in Synchronous and Asynchronous Systems[J]. Acta Electronica Sinica, 2011, 39(12): 2726-2732.
DOI：

REN Xiao-tian, XU Hui, HUANG Zhi-tao, et al. Fast-ICA Based Blind Estimation of Spreading and Information Sequences of Short-Code CDMA Signals in Synchronous and Asynchronous Systems[J]. Acta Electronica Sinica, 2011, 39(12): 2726-2732. DOI：

摘要

本文通过分析短码CDMA信号特性

将接收信号以间隔2倍扩频周期、重叠1倍扩频周期的时间窗进行分割

建模CDMA系统与线性混合的盲源分离模型一致

使建立的CDMA模型同时适用于同、异步系统.利用盲源分离方法

实现了同步系统、异步系统失步时间未知和已知条件下

各用户等功率或非等功率时

扩频序列与信息序列的盲估计.理论分析和仿真结果验证了本文方法的有效性.

Abstract

The characteristic of the Code Division Multiple Access (CDMA) signal is analyzed in this paper.And the CDMA system is modeled as the blind source separation pattern

with the received signal is divided into two-spreading-period-length temporal vectors overlapped by one spreading period.The model is applicable for both the synchronous and asynchronous systems.In the new method

the blind source separation algorithm is used to estimate the spreading sequences and information sequences blindly in synchronous and asynchronous systems

no matter the desynchronization time is known or not

and with the users' power are equally or not.At last

mathematical analysis and simulation results demonstrate the validity of the new method.

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